Right now, the only way I can see to do this is to delete the account and re-create it. This is a horrible usability problem.
Thanks for your report, but this is a duplicate of #219.
Good news: using 0.4.1 the birthdays now show up. I will set up contacts sync next to see if this is fixed, too. Thanks!
@FrViPofm Looks normal… don’t have any idea. Works on my Fairphone 2…
Address book sync should work again with v188.8.131.52-ose.